Heat the oven to 200 C / 400 F. Take the feta out of the fridge and let it sit at room temperature for 10 minutes while you prep everything else.
Place the block of feta in the center of a 25 cm / 10-inch baking dish. Scatter the cherry tomatoes around it so they sit snugly against the cheese.
Drizzle the olive oil evenly over the feta and tomatoes. Scatter the sliced garlic, dried oregano, red pepper flakes, and black pepper over everything.
Bake for 25 to 30 minutes, until the tomatoes have blistered and burst open and the feta looks soft and lightly golden on top.
Take the dish out of the oven. Use a fork to gently mash the feta and burst tomatoes together, mixing them into the oil and tomato juices until it forms a loose, chunky sauce.
Taste the mixture before adding any extra salt, since feta is already salty. Adjust with a small pinch if needed.
Scatter the fresh oregano or basil over the top. Serve warm, straight from the dish, with crusty bread for scooping.